Polymer 80 PF45 black full size 80% pistol frame. The PF45 is compatible with Gen 3 components for 3-pin Glock 20 SF and Glock 21 SF.  Next Generation Ergonomics and Features.  High-Strength Reinforced Polymer Construction.  Picatinny/STANAG Compliant Accessory Rail.  Blank Serialization Plate.  Stainless Steel Locking Block Rail System (LBRS).  Stainless Steel Drop-In Rear Rail Module (RRM).  Hardened Pins for LBRS and RRM.  Complete Finishing Jig and Drill bits Included.  New in the box.